diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index 970eece..2d870bc 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -29,6 +29,8 @@ jobs:
             cargo machete
 
             pnpm install --frozen-lockfile
+            pnpm add --save-dev --save-exact --workspace-root jscpd-linux-x64-gnu@5.0.14
+            pnpm run dup
 
             RUSTFLAGS="--cfg web_sys_unstable_apis" wasm-pack test --node wasm
             RUSTFLAGS="--cfg web_sys_unstable_apis" wasm-pack build wasm --target web
diff --git a/example/server/src/main.rs b/example/server/src/main.rs
index 08969f4..17b4164 100644
--- a/example/server/src/main.rs
+++ b/example/server/src/main.rs
@@ -38,7 +38,6 @@ async fn handle_pipe_loopback(
     conn: &mtp::webserver::WebMTPConnection,
     request: mtp::host::PipeRequest<
         mtp::webserver::WebMtpSender,
-        mtp::webserver::WebMtpReceiver,
         mtp::webserver::H3TransportReceiver,
     >,
 ) -> Result<u64, Box<dyn std::error::Error>> {
diff --git a/package.json b/package.json
index 72e0b12..dd4e7a1 100644
--- a/package.json
+++ b/package.json
@@ -61,6 +61,7 @@
     "pack": "pnpm run release:web",
     "release:web": "node create-web-release.mjs",
     "build:all": "nix run .#build-all",
+    "dup": "jscpd --pattern '**/*.{rs,ts}' --ignore 'target/**' --ignore 'wasm/pkg/**' --min-lines 8 --min-tokens 80 --threshold 4 --reporters console --no-tips .",
     "test:e2e": "tsc && node test/e2ee.mjs",
     "test:secrets": "tsc && node --test --test-isolation=none test/encrypted-secret.mjs",
     "test:wasm-init": "tsc && node --test test/wasm-init.mjs",